A:AnswerIt will not work on the iPhone 7. The only iPhones that it will work with is the iPhone 8, 8 plus, and X. Wanted to correct that since the best answer only says iPhone X.
A:AnswerI think nothing. They both use the 15W input, and I assume both offer 10-15W of output (to facilitate fast charging, which is limited to 7.5W on the iPhone). I think they're just adding $5 to the cost since it's apple-associated.
A:AnswerIf everything is plugged in correctly it may be that you have a case that’s too thick on it or it can’t read through the case. I have a tech 21 case and it works perfect with it on. Try taking off the case and charging it without it.
A:AnsweriPhone 6 does not support wireless charging so there are no wireless chargers that will work for it. You can, however, purchase a wireless charging case where the wireless charging functionality is in the case instead of the phone.